Modeling Diesel Spray Ignition Using Detailed Chemistry With a Progress Variable Approach

Lehtiniemi, Harry; Mauß, Fabian; Balthasar, Michael; Magnusson, Ingemar

doi:10.1080/00102200600793148

Cited by 53 publications

(37 citation statements)

References 27 publications

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“…in HCCI engine combustion, transported PDF approaches have also been reported in [19] which exploit in-situ tabulation of the chemistry to speed up the calculations. Other approaches utilising tabulated chemistry have been proposed for diesel spray auto-ignition in [20] and for partially premixed auto-igniting n-heptane flames in [21].…”

Section: Introductionmentioning

confidence: 99%

Experiments and Simulations of n-Heptane Spray Auto-Ignition in a Closed Combustion Chamber at Diesel Engine Conditions

Wright

Margari

Boulouchos

et al. 2009

Flow Turbulence Combust

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Auto-igniting n-heptane sprays have been studied experimentally in a high pressure, high temperature constant volume combustion chamber with optical access. Ignition delay and the total pressure increase due to combustion are highly 50 Flow Turbulence Combust (2010) 84:49-78 repeatable whereas the ignition location shows substantial fluctuations. Simulations have subsequently been performed by means of a first-order fully elliptic Conditional Moment Closure (CMC) code. Overall, the simulations are in good agreement with the experiment in terms of spray evolution, ignition delay and the pressure development. The sensitivity of the predictions with respect to the measured initial conditions, the spray modelling options as well as the chemical mechanism employed have been analysed. Strong sensitivity on the chemical mechanism and to the initial temperature on the predicted ignition delay is reported. The primary atomisation model did not affect strongly the predicted auto-ignition time, but a strong influence was found on the ignition location prediction.

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Section: Introductionmentioning

confidence: 99%

Experiments and Simulations of n-Heptane Spray Auto-Ignition in a Closed Combustion Chamber at Diesel Engine Conditions

Wright

Margari

Boulouchos

et al. 2009

Flow Turbulence Combust

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“…As long as the real flame structure corresponds to a collection of steady non-premixed flamelets, λ is constant along each flamelet and as such becomes statistically independent of Z. In [28], still another progress variable is defined, based on the enthalpy of formation integrated over Z-space, making it statistically independent of Z. Both definitions of the progress variable c and of the reaction progress parameter λ are useful with respect to condition (i) for presumed PDF modeling of flame SM1 if the composition in (Z, Y CO 2 ) space mainly corresponds to steady turbulent non-premixed flamelets.…”

Section: Progress Variable Definitions and Presumed-pdf Modeling Assumentioning

confidence: 99%

A priori investigation of PDF-modeling assumptions for a turbulent swirling bluff body flame (‘SM1’)

Meester

Naud²,

Merci

2012

Combustion and Flame

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“…They showed that no single iso-contour yields the best agreement, although they used a flame temperature of 2200 K to evaluate lift-off length. Lehtiniemi et al (2006) used the progress variable approach, with detailed chemistry, to model diesel spray ignition. To assess the applicability of the model, they Figure 12.…”

Section: Air Entrainment and Mixingmentioning

confidence: 99%

Large-eddy simulation of air entrainment during diesel spray combustion with multi-dimensional CFD

Azimov

Kim

2011

Int.J Automot. Technol.

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Large-Eddy Simulation (LES) was used to perform computations of air entrainment and mixing during diesel spray combustion. The results of this simulation were compared with those of Reynolds Averaged Navier Stokes (RANS) simulations and an experiment. The effect of LES on non-vaporizing and vaporizing sprays was evaluated. The validity of the grid size used for the LES analysis was confirmed by determining the subgrid-scale (SGS) filter threshold on the turbulent energy spectrum plot, which separates a resolved range from a modeled one. The results showed that more air was entrained into the jet with decreasing ambient gas temperatures. The mass of the evaporated fuel increased with increasing ambient gas temperatures, as did the mixture fraction variance, showing a greater spread in the profile at an ambient gas temperature of 920 K than at 820 K. Flame lift-off length sensitivity was analyzed based on the location of the flame temperature iso-line. The results showed that for the flame temperature iso-line of 2000 o C, the computed lift-off length values in RANS matched the experimental values well, whereas in LES, the computed lift-off length was slightly underpredicted. The apparent heat release rate (AHRR) computed by the LES approach showed good agreement with the experiment, and it provided an accurate prediction of the ignition delay; however, the ignition delay computed by the RANS was underpredicted. Finally, the relationships between the entrained air quantity and mixture fraction distribution as well as soot formation in the jet were observed. As more air was entrained into the jet, the amount of air-fuel premixing that occurred prior to the initial combustion zone increased, upstream of the lift-off length, and therefore, the soot formation downstream of the flame decreased.

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Modeling Diesel Spray Ignition Using Detailed Chemistry With a Progress Variable Approach

Cited by 53 publications

References 27 publications

Experiments and Simulations of n-Heptane Spray Auto-Ignition in a Closed Combustion Chamber at Diesel Engine Conditions

Experiments and Simulations of n-Heptane Spray Auto-Ignition in a Closed Combustion Chamber at Diesel Engine Conditions

A priori investigation of PDF-modeling assumptions for a turbulent swirling bluff body flame (‘SM1’)

Large-eddy simulation of air entrainment during diesel spray combustion with multi-dimensional CFD

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